基于PWM逆变器供电轴电流问题的交流电机耦合电容的计算与测量

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Abstract Through parasite capacitive coupling between the stator and rotor, damaging voltages are induced on the shafts of AC motors controlled by PWM variable frequency drives. Harmful bearing current will be produced and eventually cause bearing failure. The coupling capacitances of AC motors are key parameters in predicting shaft voltage and bearing current. The modeling and calculation of motor capacitance are investigated in this paper. Based on the structure of motors, the analytic calculation of capacitance is carried out. The influence of the motor capacity and size on the capacitance and bearing voltage ratio is analyzed. Finite element method is adopted to analyze the capacitances. A scattered motor winding model is proposed to acquire rational capacitance C_wf. 3D finite element analysis shows that the end of winding is an important factor should be considered in calculating capacitance C_wr. Finally a new measurement method of motor capacitance for small and medium motor is introduced.

Key words： AC motor bearing currents common-mode model coupling capacitance

Received: 18 January 2013 Published: 16 June 2014

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	Articles by authors
	Liu Ruifang
	Chen Jiayao
	Ma Xiping
	Cheng Jianquan
	Cao Junci

Cite this article:

Liu Ruifang,Chen Jiayao,Ma Xiping等. Calculation and Measurement of Coupling Capacitances in AC Motors Based on Bearing Currents Problem Induced by PWM Inverters[J]. Transactions of China Electrotechnical Society, 2014, 29(1): 60-67.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I1/60

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